SOLUTION: y varies inversley with x, and x = -12 when y = 5. Find the inverse variation equation and use it to find the value of x when y = 10 (I think its -12... what do you think?)

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: y varies inversley with x, and x = -12 when y = 5. Find the inverse variation equation and use it to find the value of x when y = 10 (I think its -12... what do you think?)      Log On


   

Question 323807: y varies inversley with x, and x = -12 when y = 5. Find the inverse variation equation and use it to find the value of x when y = 10
(I think its -12... what do you think?)
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
"y varies inversley with x" means that y=k%2Fx where 'k' is some number.


Plug in x = -12 and y = 5 to get 5=k%2F%28-12%29 and solve for k to get k=-60


So the equation is y=-60%2Fx. Now plug in y=10 to get 10=-60%2Fx, multiply both sides by x to get 10x=-60 and divide both sides by 10 to solve for x: x=-60%2F10=-6


So x=-6 when y=10